宫子琪,柴丽华,陈子勇,相志磊

• 1:中国天辰工程有限公司
• 2:北京工业大学材料科学与工程学院

摘要(Abstract)：

研究了β相凝固的铸造合金Ti45Al8Nb0.2W0.25Cr和Ti45Al8Nb0.2W0.25Cr0.2B0.02Y合金900℃×130 h的循环抗氧化性能,探讨了B、Y元素对合金抗氧化性能的影响。结果表明,0.2B0.02Y的添加能在一定程度上改善合金的抗氧化性能。B、Y的加入能够促进合金表层形成致密连续的Al2O3层,抑制氧元素的进一步入侵,Y的加入使得合金氧化层的抗剥落性能得到提高。分析计算得出了两种合金的氧化动力学曲线,氧化10 h后,Ti45Al8Nb0.2W0.25Cr合金的氧化动力学方程中的幂指数n=1.87,合金单位面积的氧化增重随氧化时间的变化规律介于直线规律和抛物线规律之间,即这种合金的氧化膜保护性不足。Ti45Al8Nb0.2W0.25Cr0.2B0.02Y合金氧化动力学方程中的幂指数n=2,合金单位面积的氧化增重随氧化时间的变化规律为抛物线规律,利于合金表面生成保护性的氧化膜,合金的抗氧化性较好。

关键词(KeyWords)： TiAl;氧化;β相凝固;机理

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51301005)

作者(Author): 宫子琪,柴丽华,陈子勇,相志磊

DOI: 10.13289/j.issn.1009-6264.2017.01.011

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